Accessing values from dictionaries nested in a list
up vote
0
down vote
favorite
First question here!
countries = [{'country': 'Italy', 'size':3,'reg':9},
{'country': 'Germany', 'size':7,'reg':1},
{'country': 'USA', 'size':9,'reg':4},
]
weights = {'size' : 100, 'reg' : 30}
I am trying to multiply values from the 'countries' nested dictionaries with the value associated with the matching key in the 'weights' dictionary. I tried a for loop approach as the values in 'weights' will be updated by the user.
I have tried this:
countries_weighted = copy.deepcopy(countries)
for key in weights.items():
for i in countries_weighted:
countries_weighted[i][key] *= weights[key]
That doesn't seem to work:
-
TypeError Traceback (most recent call last)
<ipython-input-52-9753dabe7648> in <module>()
13 for key in weights.items():
14 for i in countries_weighted:
---> 15 countries_weighted[i][key] *= weights[key]
16
TypeError: list indices must be integers or slices, not dict
Any idea? Thanks in advance.
python python-3.x list dictionary for-loop
edited Nov 22 at 16:50
jpp
88k195099
asked Nov 22 at 16:36
dpppstl
1
add a comment |
up vote
0
down vote
favorite
First question here!
countries = [{'country': 'Italy', 'size':3,'reg':9},
{'country': 'Germany', 'size':7,'reg':1},
{'country': 'USA', 'size':9,'reg':4},
]
weights = {'size' : 100, 'reg' : 30}
I am trying to multiply values from the 'countries' nested dictionaries with the value associated with the matching key in the 'weights' dictionary. I tried a for loop approach as the values in 'weights' will be updated by the user.
I have tried this:
countries_weighted = copy.deepcopy(countries)
for key in weights.items():
for i in countries_weighted:
countries_weighted[i][key] *= weights[key]
That doesn't seem to work:
-
TypeError Traceback (most recent call last)
<ipython-input-52-9753dabe7648> in <module>()
13 for key in weights.items():
14 for i in countries_weighted:
---> 15 countries_weighted[i][key] *= weights[key]
16
TypeError: list indices must be integers or slices, not dict
Any idea? Thanks in advance.
python python-3.x list dictionary for-loop
edited Nov 22 at 16:50
jpp
88k195099
asked Nov 22 at 16:36
dpppstl
1
for i in countries_weighted:will return the values incountries_weightedto your variablei, not the index. So in this caseigets an entire dictionary each time. So replacingcountries_weighted[i][key] *= weights[key]withi[key] *= weights[key]should work for you. But Esteban Quiros's code below is much cleaner
– Dan
Nov 22 at 16:47
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
First question here!
countries = [{'country': 'Italy', 'size':3,'reg':9},
{'country': 'Germany', 'size':7,'reg':1},
{'country': 'USA', 'size':9,'reg':4},
]
weights = {'size' : 100, 'reg' : 30}
I am trying to multiply values from the 'countries' nested dictionaries with the value associated with the matching key in the 'weights' dictionary. I tried a for loop approach as the values in 'weights' will be updated by the user.
I have tried this:
countries_weighted = copy.deepcopy(countries)
for key in weights.items():
for i in countries_weighted:
countries_weighted[i][key] *= weights[key]
That doesn't seem to work:
-
TypeError Traceback (most recent call last)
<ipython-input-52-9753dabe7648> in <module>()
13 for key in weights.items():
14 for i in countries_weighted:
---> 15 countries_weighted[i][key] *= weights[key]
16
TypeError: list indices must be integers or slices, not dict
Any idea? Thanks in advance.
python python-3.x list dictionary for-loop
edited Nov 22 at 16:50
jpp
88k195099
asked Nov 22 at 16:36
dpppstl
1
First question here!
countries = [{'country': 'Italy', 'size':3,'reg':9},
{'country': 'Germany', 'size':7,'reg':1},
{'country': 'USA', 'size':9,'reg':4},
]
weights = {'size' : 100, 'reg' : 30}
I am trying to multiply values from the 'countries' nested dictionaries with the value associated with the matching key in the 'weights' dictionary. I tried a for loop approach as the values in 'weights' will be updated by the user.
I have tried this:
countries_weighted = copy.deepcopy(countries)
for key in weights.items():
for i in countries_weighted:
countries_weighted[i][key] *= weights[key]
That doesn't seem to work:
-
TypeError Traceback (most recent call last)
<ipython-input-52-9753dabe7648> in <module>()
13 for key in weights.items():
14 for i in countries_weighted:
---> 15 countries_weighted[i][key] *= weights[key]
16
TypeError: list indices must be integers or slices, not dict
Any idea? Thanks in advance.
python python-3.x list dictionary for-loop
python python-3.x list dictionary for-loop
edited Nov 22 at 16:50
jpp
88k195099
asked Nov 22 at 16:36
dpppstl
1
edited Nov 22 at 16:50
jpp
88k195099
asked Nov 22 at 16:36
dpppstl
1
edited Nov 22 at 16:50
jpp
88k195099
edited Nov 22 at 16:50
jpp
88k195099
edited Nov 22 at 16:50
jpp
88k195099
88k195099
asked Nov 22 at 16:36
dpppstl
1
asked Nov 22 at 16:36
dpppstl
1
asked Nov 22 at 16:36
dpppstl
1
1
for i in countries_weighted:will return the values incountries_weightedto your variablei, not the index. So in this caseigets an entire dictionary each time. So replacingcountries_weighted[i][key] *= weights[key]withi[key] *= weights[key]should work for you. But Esteban Quiros's code below is much cleaner
– Dan
Nov 22 at 16:47
add a comment |
for i in countries_weighted:will return the values incountries_weightedto your variablei, not the index. So in this caseigets an entire dictionary each time. So replacingcountries_weighted[i][key] *= weights[key]withi[key] *= weights[key]should work for you. But Esteban Quiros's code below is much cleaner
– Dan
Nov 22 at 16:47
for i in countries_weighted: will return the values in countries_weighted to your variable i, not the index. So in this case i gets an entire dictionary each time. So replacing countries_weighted[i][key] *= weights[key] with i[key] *= weights[key] should work for you. But Esteban Quiros's code below is much cleaner– Dan
Nov 22 at 16:47
for i in countries_weighted: will return the values in countries_weighted to your variable i, not the index. So in this case i gets an entire dictionary each time. So replacing countries_weighted[i][key] *= weights[key] with i[key] *= weights[key] should work for you. But Esteban Quiros's code below is much cleaner– Dan
Nov 22 at 16:47
add a comment |
3 Answers
3
active
oldest
votes
up vote
2
down vote
You could do it like this:
countries = [{'country': 'Italy', 'size':3,'reg':9},
{'country': 'Germany', 'size':7,'reg':1},
{'country': 'USA', 'size':9,'reg':4},
]
weights = {'size' : 100, 'reg' : 30}
for country in countries:
for key in weights.keys():
country[key] *= weights[key]
print(countries)
answered Nov 22 at 16:42
Esteban Quiros
1015
Makes sense.hank you Esteban Quiros, Dan and JPP for your help!
– dpppstl
Nov 23 at 15:12
add a comment |
up vote
0
down vote
There are a couple of issues:
dict.itemscycles key-value pairs, not just keys;- when you iterate
countries_weightedyou should usei.
So you can amend as follows:
for key, value in weights.items():
for i in countries_weighted:
i[key] *= value
answered Nov 22 at 16:45
jpp
88k195099
add a comment |
up vote
0
down vote
Only need to write countries_weighted[i][key] *= weights[key] as i[key] *= weights[key].
answered Dec 4 at 9:10
mengxun
414
add a comment |
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
2
down vote
You could do it like this:
countries = [{'country': 'Italy', 'size':3,'reg':9},
{'country': 'Germany', 'size':7,'reg':1},
{'country': 'USA', 'size':9,'reg':4},
]
weights = {'size' : 100, 'reg' : 30}
for country in countries:
for key in weights.keys():
country[key] *= weights[key]
print(countries)
answered Nov 22 at 16:42
Esteban Quiros
1015
Makes sense.hank you Esteban Quiros, Dan and JPP for your help!
– dpppstl
Nov 23 at 15:12
add a comment |
up vote
2
down vote
You could do it like this:
countries = [{'country': 'Italy', 'size':3,'reg':9},
{'country': 'Germany', 'size':7,'reg':1},
{'country': 'USA', 'size':9,'reg':4},
]
weights = {'size' : 100, 'reg' : 30}
for country in countries:
for key in weights.keys():
country[key] *= weights[key]
print(countries)
answered Nov 22 at 16:42
Esteban Quiros
1015
Makes sense.hank you Esteban Quiros, Dan and JPP for your help!
– dpppstl
Nov 23 at 15:12
add a comment |
up vote
2
down vote
up vote
2
down vote
You could do it like this:
countries = [{'country': 'Italy', 'size':3,'reg':9},
{'country': 'Germany', 'size':7,'reg':1},
{'country': 'USA', 'size':9,'reg':4},
]
weights = {'size' : 100, 'reg' : 30}
for country in countries:
for key in weights.keys():
country[key] *= weights[key]
print(countries)
answered Nov 22 at 16:42
Esteban Quiros
1015
You could do it like this:
countries = [{'country': 'Italy', 'size':3,'reg':9},
{'country': 'Germany', 'size':7,'reg':1},
{'country': 'USA', 'size':9,'reg':4},
]
weights = {'size' : 100, 'reg' : 30}
for country in countries:
for key in weights.keys():
country[key] *= weights[key]
print(countries)
answered Nov 22 at 16:42
Esteban Quiros
1015
edited Nov 22 at 16:47
answered Nov 22 at 16:42
Esteban Quiros
1015
answered Nov 22 at 16:42
Esteban Quiros
1015
answered Nov 22 at 16:42
Esteban Quiros
1015
1015
Makes sense.hank you Esteban Quiros, Dan and JPP for your help!
– dpppstl
Nov 23 at 15:12
add a comment |
Makes sense.hank you Esteban Quiros, Dan and JPP for your help!
– dpppstl
Nov 23 at 15:12
Makes sense.hank you Esteban Quiros, Dan and JPP for your help!
– dpppstl
Nov 23 at 15:12
Makes sense.hank you Esteban Quiros, Dan and JPP for your help!
– dpppstl
Nov 23 at 15:12
add a comment |
up vote
0
down vote
There are a couple of issues:
dict.itemscycles key-value pairs, not just keys;- when you iterate
countries_weightedyou should usei.
So you can amend as follows:
for key, value in weights.items():
for i in countries_weighted:
i[key] *= value
answered Nov 22 at 16:45
jpp
88k195099
add a comment |
up vote
0
down vote
There are a couple of issues:
dict.itemscycles key-value pairs, not just keys;- when you iterate
countries_weightedyou should usei.
So you can amend as follows:
for key, value in weights.items():
for i in countries_weighted:
i[key] *= value
answered Nov 22 at 16:45
jpp
88k195099
add a comment |
up vote
0
down vote
up vote
0
down vote
There are a couple of issues:
dict.itemscycles key-value pairs, not just keys;- when you iterate
countries_weightedyou should usei.
So you can amend as follows:
for key, value in weights.items():
for i in countries_weighted:
i[key] *= value
answered Nov 22 at 16:45
jpp
88k195099
There are a couple of issues:
dict.itemscycles key-value pairs, not just keys;- when you iterate
countries_weightedyou should usei.
So you can amend as follows:
for key, value in weights.items():
for i in countries_weighted:
i[key] *= value
answered Nov 22 at 16:45
jpp
88k195099
answered Nov 22 at 16:45
jpp
88k195099
answered Nov 22 at 16:45
jpp
88k195099
answered Nov 22 at 16:45
jpp
88k195099
88k195099
add a comment |
add a comment |
up vote
0
down vote
Only need to write countries_weighted[i][key] *= weights[key] as i[key] *= weights[key].
answered Dec 4 at 9:10
mengxun
414
add a comment |
up vote
0
down vote
Only need to write countries_weighted[i][key] *= weights[key] as i[key] *= weights[key].
answered Dec 4 at 9:10
mengxun
414
add a comment |
up vote
0
down vote
up vote
0
down vote
Only need to write countries_weighted[i][key] *= weights[key] as i[key] *= weights[key].
answered Dec 4 at 9:10
mengxun
414
Only need to write countries_weighted[i][key] *= weights[key] as i[key] *= weights[key].
answered Dec 4 at 9:10
mengxun
414
answered Dec 4 at 9:10
mengxun
414
answered Dec 4 at 9:10
mengxun
414
answered Dec 4 at 9:10
mengxun
414
414
add a comment |
add a comment |
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for i in countries_weighted:will return the values incountries_weightedto your variablei, not the index. So in this caseigets an entire dictionary each time. So replacingcountries_weighted[i][key] *= weights[key]withi[key] *= weights[key]should work for you. But Esteban Quiros's code below is much cleaner– Dan
Nov 22 at 16:47